Lathe



Feb. 27, 1945. K, F BERGER 2370,286v

LATHE Filed Dec. 18, 1941 2 Sheets-Sheet 1 3/ 30 /9 Z2 y/l f /7 xNv NToRafL Berger Feb. 27, 1945.` K. F. BERGER 2,370,286

LATHE Filed Dec. 18, 1941 v2 Sheets-Sheet 2 I IIIIIINIIIIIHIIIIIIIIII 3535 37a 50l 5|NvENT R arZ [ier er BY A'roRNEYs Patented Feb. 27, 1945limiti)g sTATEsPATENT OFFICE:

LATHE Karl F. Berger, Fairfield, Conn. Application December 18, 1941,Serial No. 423.4%?!

4 claims. (C1. 77-60) vThis invention relates to a lathev attachment,

yand, more particularly,to an attachment adapted to convert a lathe intoa hand-operated screw machine or the like. l

I have discovered'that by means of the attachment of the presentinvention, a lathe can be changed over and made to perform, in additionto its usual functions, the function of a hand-I loperated screw machineorthe like.

This conversion can be carried out without in any way adverselyeffecting the structure lof the lathe or interfering with it being usedas such whenever desired. This is very important from a practicalviewpoint, especially at present in connection with national defensework, since it tioning the tailstock on the bed of the lathe, in-

serting a tool-holder in the end of the spindle in place of the usualcenter, and providing suitable controls and Stops on the spindle andtailstock 4body for regulating the position and action of a tool carriedby the tool-holder.

In the preferred form of the invention, the bed of the lathe hassecuredr thereto an adjustable stop by which the position of thetailstock can be accurately regulated with respect to the work support.The spindle-of the tailstock which carries the tool-holder or chuck hasa yoke locked around it, and the body of the tailstock has a bracketthereon, the yoke and bracket carrying and cooperating with theelementsl of a stop means so as to limit the operation of the tool as itmoves into and operates on the work. The stock means may be accuratelyadjusted so that the operation of the tool can be very closely cona vtrolled.

If desired, a plurality of stop means may be Aprovided and mounted so asto be selectively posi-"- tioned for use by a quick manipulationlthereof to alter or vary the extent to which-the 'tool may Fig. 3 is asectional View taken along line 34-3.

Fig. 4 is a side elevational `view of the tailstock showing another formof my invention.

' Fig. 5 is a detailed sectional view of a portion of the tailstocktakenv along lines 5-`5 of Fig. 7.

Fig. 6 is a sectional View taken along line 6-6 of Fig. 5. l

Fig. 7 is a plan view of the tailstock shown in Fig. 4,

Thepresentinvention is illustrated as applied to a lathe I0 having arotatable work support or chuck II provided with the adjustable jaws I2which can be quickly operated for engaging and gripping and centeringthe Work. The chuck s rotated by suitable power mechanism generallyindicated at I3. The lathe is `provided with the usual tailstock I 4having a pedestal I5 clamped 'the spindle'is aligned with the axis ofrotation of the .work support and is provided with the usualcenter-receiving.socket'ZI. A clamp 22 on the side of the tailstock maybe operated if desired,

-tolock the spindle in its adjusted position. In thelathe shown in thedrawings, the usual feed screw, tool-carrying saddle and apron have beenomitted `for the. sake of clarity. It is to be underi stood thattheseelements may remain on the lathe while the'present invention is used,ralthough they are disabled. The lathe Athus farl described isthe-standard lathe construction.

In carrying out the present invention to change over this usual lathe toa hand-operated screw machine or the like without modifying thestructure thereof, a saddle 25 is disposed so as to overlie thevbedandapproximately position the tailstock. The saddle is clamped. thereto byal bolt 25 threadedl into a clamping plate 21 engaging the underside'ofthe bed asshown in Fig..3. The saddle hasa b'olt28 threaded therethroughandadaptedf to vproject therefrom so that the end .forms an abutmentwhich is engaged by the end of the pedestal l5 as it is moved intoposition on the bed'of'the lathe. The tailstock is thenlocked inposition by the nut and bolt.

The stop :28 maybe finely adjusted in the saddle so that the end thereofand the tailstock located thereby is accurately positioned with respectto the work support. After the bolt has been set, a lock nut 29 isturned into engagement with the saddle to lock the bolt 28 in adjustedposition.

When the tailstock is located, the clamp 22 is I released so that thespindle i8 is free for movement, and the usual center (not shown) isremoved from the spindle and a tool-holder or chuck 30 having jaws 3i isinserted in its place and is adapted to receive and hold a suitablecutting tool 32 depending on the type o! work to be performed.

Before the work holder is inserted in the socket, however, a yoke 33having a projecting portion 33a is slipped over the free end of thespin.- dle I9 with the portion 33a extending laterally as shown in Fig.2. The yoke is clamped thereto by a bolt 34 passing through an aperturein one side of the yoke and threaded' into the othery as shown in Fig.3. The projecting portion of the yoke has a threaded rod 35 securedthereto vfor movement therewith. The rod i's arranged to project backalong the tailstock and may be secured to the yoke by any suitablemeans, as welding, sweating in, or byl being provided with a head 35'engaging one face of the yoke and having a nut 38 threaded on the rodinto engagement with the other face of the yoke to clamp it in position.

An abutment is formed by a bracket 3l having an aperture 38 thereinwhich is bolted tothe barrel of the tailstock by bolts. 'I'he rod i's soarranged that it passes freely through the aperture I8 1n the bracket. Astop nut lfisthreaded on the rod so as to engage the bracket when thespindle, and the rod' connected thereto, has been moved so as to carryVthe tool' to the end o! its desired movement.. AV lock nut Il' holdsthestop in adjusted position. The adjustment of the stop along the threadedrod is very accurate so that the limit -of movement ofthe tool inrepeated operations can'be controlled.

If desired, the stop means oi' the present in*- vention may be soarranged' as to provide a plurality of adjustable stops which may bereadily selectively positioned to provide for variations in the movementof the tool'. Meansr for carrying out this feature of the invention isshown in the drawings in Figs. 4` to 7 inclusive.

It will be noted in these figures that the projecting portion '33a' of'the yoke 33secured` tothe spindle I9 extends laterally a greaterextentthan in Fig. 1' andthe bracket'y 3T secureda to thebarrel of thetailstock extends out substantially the same distance and has a stop.yengaging face 31a. With this construction, the threaded rod. 35, whichis supported bythe portion aand brack et, is positionedat a greaterdistancey from the side of the tailstock and permits the multiple stopmeans, illustrated as a disk or plate 50 carrying a plurality of stopbolts 5i, to be positioned thereon. i

While the disk 50. may-be mounted on the rod 4 in manyy ways, in thepreferred' form of the invention thev rod 38 is.y providedv with aflatsurface 35a', and a sleeve, 5I: having a flange 82a.l at one endthereoiis slidablyf disposed' over the rod and clamped in adjusted'.position. along4 the rod by a pair or nuts 53; I4 and' a. lock nut Mathread:- ed on the rod. The sleeve is held against rotation on the rodby means. of a. set screw l5 threaded intov a radially' disposed' holeA58t inI the flange until the end thereof engages the-ati-surface 35aofthe rod'.

The disk is providedwith a. bore. and' is adapted to be slipped over thesleeve and has: a huir l] As shown in Fig. 6, the bolts may, bysuitableV adjustment. be made to project from the face of the plate tovarious extents and are secured Vin position by lock nuts GII turnedinto engagement with. one face of the stop plate. By providing a verytine thread on the bolts, the positioning of the stop bolt can be veryaccurately controlled.

The projecting ends of the bolts are arranged the disk sa that theselected one ofy them will engage the. dat face. 31a oi the bracket whenthe tool hasi moved its required amount.

It will be noted that in thev preterred'form o! the. invention,thebracket has its stop engaging portion 31a. laterally` offset topermit theV bolts having a less projection to engage the face 31awithout interference by other bolts on the plate `which may have agreater projectionk from the face. of the diskas is shown in Fig. 7..

The distance whichV the tool is permitted to move can be quickly' andeasily varied by selecting the proper stopV bolt and rotating the dinkuntil this. bolt is located. in operative position m coact with. theface 31a oi" the bracket. With this arrangement, repeated changes inthethrow of the tool can be made,.and.each will be accurately determinedand constant throughout the operation.

In order to hold the disk inl adjusted position, the sleeve 52: isprovided `with a plurality of recessesl 62 disposed in the outer surfacethereof in predetermined relation tothe stop bolts, and the hub 5-1 ofthe stop disk or plate is provided with a ballv detent 63 urged into therecesses on thev sleeve by a spring. 64 carried in a transverse aperture65 in the hub'.y

This provides a yieldable means for holding the stop plate in position'ywhich; permits it to be readily rotated to selectively position thedesired stop in operativeA relation to the bracket. The multiple stopmeans isf a great advantage whenA the device is used to,.ior example,lperform a series of operations requiring movement of the tailstockspindle to diilerent positions as the variation of.' the stops toproduce the different positions can be had by merely swinging the stopplate to present. cher required. stopA member.

While six` stop members have been shown` in the drawingait is: to beunderstood that any de'- sired number of stops can be used as required.

In the broader aspects of the present invention, the rod need not bethreaded. as the abutments may beV secured` irradiusted positionthereon. by' set screws or the like. Also, the rod may be fixed' to the:body of: the tailstock and the pn jecting portion ofv the yoke utilizedasA a. stop member for engagingv adjustable. abutmentgi car'- ried bythe rod..

Variations and modiiications may be` made within the scope of thisinventionk andl portions ofthe improvements may7 be nsedf withoutothers.

I claim:

I. In a lathe having al bed provided with a rotatable work support 'anda tatlstoek having fa spindle projecting therefrom, and means for movingthe spindle toward and away from said support; stop means secured to thebed for adjustably positioning the tailstock in predetermined relationto the Work support; a tool-holder mounted on the free end of thespindle and adapted to receive a tool; an abutmenton the body of thetailstock; and means carried by the spindle and having adjustable meanscooperating with the abutment for limiting movement of the tool towardthe work support.

2. In a lathe having a bed provided with a rotatable work support and atailstock having a spindle projecting therefrom, and means for movingthe spindle toward and away from said support; a saddle clamped to thebed of the lathe and having a stop adjustably mounted thereon to engagethe tailstock and position it in predetermined relation to the worksupport; a tool-holder mounted on the free end of the spindle andadapted to receive a tool; an abutment on the body of the tailstock; andmeans carried by the spindle and having adjustable means cooperatingwith the abutment for limiting movement of the tool toward the Worksupport.

3. In a lathe having a rotatable work support and a movable tailstockhaving a spindle projecting therefrom, and means for moving the spindletoward and away from said support; means for limiting movement of thetailstock to ward the work support; a chuck mounted on the free end ofthe spindle and adapted to receive a tool; a yoke secured to thespindle; a bracket mounted on the body of the tailstock; and meansvcarried by and cooperating with the yoke and bracket and including astop for limiting movement of the spindle and tool toward the worksupport.

4. In a lathe having a rotatable work support and a movable tailstockhaving a spindle projecting therefrom, and means for moving the spindletoward and away from said support; means for limiting movement 0f thetailstop to-v ward the work support; a chuck mounted on the free end ofthe spindle and adapted to receive a tool; a yoke secured to the spindleand bracket rigidly xed to the body of the tailstock; and means,including a plurality of adjustable stops mounted so as to beselectively moved into operative position, carried by and cooperatingwith the yoke and bracket, including a stop member for limiting movementof the tool toward the work support.

KARL F. BERGER.

